Sound modulator



lune 23, 1925. 1,542,906

` E. M. PACE l S OUND MODULATOR Filed July 19, 1922 e, f5 i I v /g l www fox Ethel M ane..

SH01 wagt Patented June 23, 1925.l

UNITED STATES PATENT OFFICE.

- ETHEL I. PACE, F 'VICKSBUEGI MISSISSIPPI, ASSIGNOB 0Fl ONE-HALF TO EDWARD ONEILL, JR., 0F NEW ORLEANS, LOUISIANA.

SOUND HODULATOB.

iApplication filed July 19, 1922. Serial No. 578,064.

To all whom it 'ma concern.:

Be it known that ETHEL MARTIN PACE, a citizen of the United States, residing at Vicksbur in the county of Warren and State of 'lississip i, have invented certain new and useful m rovements in Sound Modulators, of whic the following is a specification.

This invention relates to en improved type of tone modulator and amplifier, which ma be ud in connection with phonographs an the like.

The primary object of `this invention is the provision of a modulating device for use in connection with phonographs, whereby needless and annoying sounds, such as needle scratches, harsh metallic sounds, etc., may be eliminated so that the reproduced sound emanating from the modulator may be full, clear and even.

A further object of this arrangementis the provision of tone modulating device adapted for use in connection with sound reproducing mechanisms, whereby the relproduced sound escapes through a tortuous path; sound waves being uided within the same and modulated so t at scratches and other undesirable ,noises are eliminated therein, so that a clear and distinct sound 80 is delivered to listeners.

A further object of this invention is the provision of a tone modulating member which may be utilized in connection with phonograph cabinets and so disposed there- 8| in in compact manner that the cabinet may be utilized for t-he storing of records and the like.

Other ob'ects and advantages of this invention wil be apparent during the course UI of the following detailed description.

- In the accompanying drawing, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several I views. v y

Figure 1 is a transverse cross sectional view taken through a cabinet type of phonograph, showing the improved modulator as mounted therein in section.

I0 Figure 2 is a.. erspective view of the im roved tone mo ulator.

n the drawing, wherein for the purpose 'be covere of illustration is shown the preferred ein bodiinent of the improved tone modulator, the letter A designates the modulator, which may be utilized in connection with a sound reproducing apparatus B, and mounted in a cabinet C.

The cabinet C, in general formation, is of the conventional type, including side walls 10; bottom wall 11; rear wall 12; frontl wall 13; supporting platform 15 upon which the motor 16 and turn table 17 of the sound reproducer device B are mounted, and in which the tone arm 18 of the sound reproducing device B is movably connected; and a closure arrangement 20, hingedly connected to the rear wall 12 whereby the tonej arm arran ement 18 and turn table 17 may upon the supporting platform 15, as in the ordinary onograph cabinet formation. The de ning end 21 of the tone arm 18 exten s into the large compartment 22 provided by the side, front and rear walls of the cabinet C, adjacent the rear wall 12.

Generically, the improved tone modulator comprises a casing havin a tortuous passagewa therethrough an providing a constricte inlet opening which receives the sound waves from the tone arm 18, the

assageway from this inlet gradually enarginr in dimension, so that the passageway t rough the tone modulator is of greatest dimension intermediate its inlet and outlet openings. The sound waves pass through the casing and are then led through a constricted outlet to a sound horn or similar arrangement.

Referring to the ty e of tone modulator A as is illustrated in t e drawing, the same includes an inletportion 25; an outlet portion 26; an intermediate portion 27; and

may also include a delivery horn 28. The modulator is constructed of an l' ht material, such as rose wood, an re atively thin. All joints of the arts thereof must be airtight and in particular those joints by which the inlet and outlet portions are connected to the intermediate portion.

The inlet portion 25 may be of polygonal cross section and includes a neck piece 30 provid-in the constricted inlet opening 31; said nec 30 being that portion which is ice mngomont of parts may be made without iirfpzn'ting from the spirit of the invention or scopo of. the Claim.

E' daim:

5 A phonograph horn comprising :1 body poltion providing :L rffslativoly large cham bei' therein having an open top, and :l bottoni waihn partition secured within sai@ body portion :ind extending from the open if! top und terminating snort of the closed bottoni to subdivide the ohan'ibox into two portions which have communication adjacent the bottom of the 'body portion, and inlet and outlet portions secured upon the body portion at substantially the sanne piano, Said inlet and outlet portions each being disposed over a sub-divided portion of the body portion. chamber and having communication therewith.

ETHEL PACE. 

